[作业] Sql (一)

Revising the Select Query I

Query all columns for all American cities in CITY with populations larger than 100000. The CountryCode for America is USA.

Input Format

The CITY table is described as follows: 

select * 
from CITY 
where 
POPULATION > 100000 and COUNTRYCODE = 'USA';

Revising the Select Query II

Query the names of all American cities in CITY with populations larger than 120000. The CountryCode for America is USA.

Input Format

The CITY table is described as follows: 

SELECT NAME FROM CITY WHERE POPULATION > 120000 AND COUNTRYCODE = 'USA';

Select All

Query all columns (attributes) for every row in the CITY table.

Input Format

The CITY table is described as follows: 

select * from CITY;

Select By ID

Query all columns for a city in CITY with the ID 1661.

Input Format

The CITY table is described as follows:

 

 

Current Buffer (saved locally, editable)     

 

SELECT * FROM CITY WHERE ID = 1661; 

Japanese Cities' Attributes

Query all attributes of every Japanese city in the CITY table. The COUNTRYCODE for Japan is JPN.

Input Format

The CITY table is described as follows:

SELECT * FROM CITY WHERE COUNTRYCODE = "JPN";

Japanese Cities' Names

Query the names of all the Japanese cities in the CITY table. The COUNTRYCODE for Japan is JPN.

Input Format

The CITY table is described as follows:

SELECT NAME
FROM CITY
WHERE COUNTRYCODE = 'JPN';

Higher Than 75 Marks

Query the Name of any student in STUDENTS who scored higher than 75 Marks. Order your output by the last three charactersof each name. If two or more students both have names ending in the same last three characters (i.e.: Bobby, Robby, etc.), secondary sort them by ascending ID.

Input Format

The STUDENTS table is described as follows:The Name column only contains uppercase (A-Z) and lowercase (a-z) letters.

Sample Input

Sample Output

Ashley
Julia
Belvet

Explanation

Only Ashley, Julia, and Belvet have Marks > 75. If you look at the last three characters of each of their names, there are no duplicates and 'ley' < 'lia' < 'vet'.

SELECT NAME FROM STUDENTS WHERE MARKS > 75 ORDER BY RIGHT(NAME, 3), ID ASC;

Employee Names

Write a query that prints a list of employee names (i.e.: the name attribute) from the Employee table in alphabetical order.

Input Format

The Employee table containing employee data for a company is described as follows:

where employee_id is an employee's ID number, name is their name, months is the total number of months they've been working for the company, and salary is their monthly salary.

Sample Input

Sample Output

Angela
Bonnie
Frank
Joe
Kimberly
Lisa
Michael
Patrick
Rose
Todd

SELECT NAME FROM EMPLOYEE
order by NAME;

Employee Salaries

Write a query that prints a list of employee names (i.e.: the name attribute) for employees in Employee having a salary greater than  $2000 per month who have been employees for less than 10 months. Sort your result by ascending employee_id.

Input Format

The Employee table containing employee data for a company is described as follows:

where employee_id is an employee's ID number, name is their name, months is the total number of months they've been working for the company, and salary is the their monthly salary.

Sample Input

Sample Output

Angela
Michael
Todd
Joe

Explanation

Angela has been an employee for 1 month and earns $3443  per month.

Michael has been an employee for 6 months and earns $2017  per month.

Todd has been an employee for  5 months and earns  $3396 per month.

Joe has been an employee for 9  months and earns  $3575 per month.

We order our output by ascending employee_id.

SELECT name FROM Employee
WHERE salary > 2000 AND months < 10
ORDER BY employee_id;